Adding Fractions with Unlike Denominators
1 1
____ + ____ =
2 4
3
__
4
1 1
____ - ___ =
2 4
1
___
4
3 2
____ + ___ =
4 3
17
____
12
What is a denominator?
The number below the line in a fraction.
Convert the mixed number 2 1/4 into an improper fraction.
9/4
1 2
____ + ___ =
6 3
5
___
6
2 1
____ - ___ =
3 6
3
_____
6
1 5
____ + ___ =
4 12
8
______
12
What is a numerator?
The number above the line in a fraction.
Convert the improper fraction 9/5 into a decimal.
1.8
1 3
____ + ___ =
5 10
5
____
10
1 1
____ - ___ =
5 10
1
_____
10
2 4
____ + ___ =
4 16
12
____
16
What does equivalent mean?
Equal
Convert the mixed number 1 2/5 into a percentage.
1.4
6 2
____ + ___ =
12 6
2
_____
12
2 2
____ - ___ =
4 8
2
___
8
3 4
____ - ___ =
5 15
5
____
15
What does simplify mean?
To make the fraction smaller; to put in its smallest form
Arrange the following values in order from smallest to largest:
0.85, 82%, 18/20
82%, 0.85, 18/20
2 7
____ + ___ =
7 14
11
_____
14
4 1
____ - ___ =
6 12
7
___
12
2 2
____ - ___ =
7 21
4
_____
21
What is a common denominator?
When the bottom number of the fraction is the same for both fractions.
A recipe for a large cake requires 3 1/2 cups of flour. You need to make a smaller cake that is only 60% of the original size. How much flour, written as an improper fraction, do you need for the smaller cake?
21/10 cups